I've run over a dead deer before, too. It was late at night and by the time it was noticed, it was too late to avoid without a dangerously drastic maneuver. No damage done, fortunately.

I once saw a potted tree in a lane. It had fallen off a landscape truck. The truck was pulled off to the side, backing up to retrieve the tree. At least they weren't leaving it there in the road.

Ladders in the roadway are pretty common, too. They fall off work truks when a bungee cord breaks or comes loose.

When I was driving to work up I-77 one freezing morning in Ohio, I looked in my rear-view and saw BLACK. Solid black in your rear-view mirtror is a bit unnerving, I must say. Upon closer inspection, I realize that my bedliner had come loose and was flapping up to the point it was obscuring my rear-view. Moments later, my bedliner was airborne.
Traffic was relatively light, fortunately, but I think it scared the **** out of a Dodge Neon about 8 car lengths behind me. The bedliner flew up about 30 feet or so and drifted off to the shoulder, where it came to rest, not blocing any traffic lanes.
I continued on my way to work and had a good laugh about it. IIRC, the power was out that day, so they sent us home.

A few years ago, I was following some guy who was going camping I guess, and he dropped a big *** log onto the road, and I had no choice but to run over it.

Last year, some idiot working on the road construction left a 3" lip in the middle of the road where they grinded away the road to repave it. this is on the FREEWAY! I hit it @ 45 mph, nothing I could do (rush hour traffic) cause it spanned through ALL 6 lanes!!! It blew out my struts, bent all 4 wheels, cracked my windshield, and cracked my front bumper. I called the city, they sent me to the construction company, they in turn sent me back to the city. I said screw it and called insurance company. They fixed it.

A few months later its raining like hell in the freeway, I got to go around some guy whos driving slow in the fast lane, and theres a stand that holds a roadsign sitting inthe middle of the lane Im getting into, luckily I just swirved to miss it and it just slightly tapped my front bumper (gotta love a good suspension/tire setup that you just had replaced).

I have had a couple close calls myself been driving for about 4 years.

One time I was following a garbage truck and a hubcap came off from the garbage and went flying like a UFO. This was on the highway, swerved and smashed the side of the car.

Another time on the highway a person was getting on the highway in front of me, he had a brand new refrigerator. Of course it was not tied down good and he accelerated hard and the fridge flipped of his truck and landed in front of me, stopped just in time before hitting it.

Yet another time on the highway following a semi which hit a deer, saw the dear fly over my car.

Have hit one squirrel, and about 5 birds, near misses with deer, wild turkeys and a horse.

Have hit a muffler that came off a car in front of me when he went over railroad tracks.

Garbage cans and bags and other things of that nature.

Once ran over a glass beer bottle, heard it break but thankfully it did not give me a flat tire.

Been run off the road more times then I like to count and found myself normally in a ditch or field.